Mezmerize DCB1 Building Thread - Page 56

atupi · 6th May 2012, 08:46 PM

Salas thanks for your inspiration, i've found the problem and like always was an human error in the pcb design. Now my buffer sings very very nice and makes a nice team with the Simplistic Riaa

Salas · 6th May 2012, 09:53 PM

Excellent. Enjoy.

atupi · 13th May 2012, 10:55 AM

After building and testing the DCB1 with plain resistors i want to buy some better quality resistors (mainly for buffer part) and i ask you what to choose (preferably from Mouser ).

What about CF1/4CT52R221G KOA Speer Carbon Film Resistors - Through Hole

or these

RN55C2200BRE6 Vishay/Dale Metal Film Resistors - Through Hole

If you have some other sugestion i'm open to something else.

KatieandDad · 13th May 2012, 11:02 AM

Snake oil territory - beware.

The Vishay RN55 are pretty good.

AndrewT · 13th May 2012, 11:05 AM

metal film, 1%, 25 or 50ppm/C, all copper connections (non iron, Fe) are very good.
0.1% and 15ppm are not worth paying the extra for unless the circuit specifically requires those.

KatieandDad · 11:38 AM

I used DALE 1% Metal Films in the signal path.

There was much more improvement to made with the caps.

I used Siemens 1.0uF MKP caps at the input and Oblligato 10uF PIOs at the output.

Again, the difference is subtle and definite snake oil territory.

You wont fit these caps on a Mesmorize board though. I used a homebrew clone of the original B1 board.

The resistors at the bottom right of the board are not in the signal path so I just used good quality 1% metal films there.

I can't find the original photo so I'll post it again - Apologies to the Moderators.

I eventually used the Mesmorise board as a Salas shunt reg with my homebrew Pass B1 boards.

atupi · 13th May 2012, 11:38 AM

Forgot to ask you if worth to buy some BL grade transistors if i have matched GR transistors with Idss around 5.5

KatieandDad · 13th May 2012, 11:40 AM

I used these

eBay - The UK's Online Marketplace

Whether you will notice any difference is up to you.

dimkasta · 13th May 2012, 11:46 AM

Guys I am waiting for some mesmerize boards I got from the diyaudio store and I am currently planning on the rest of the parts.
What I was wondering is if there is a way to get two outputs from the board, so that I can drive 4 monoblock amps (dual - dual mono setup driving woofers and mid-twitters separately)
Thanks a lot
Dimitri

Tea-Bag · 13th May 2012, 11:47 AM

I've listened to KOA Carbon Films and Dale CMF55, and prefer the Dales. The Carbon Films were too smooth for me.
There is very little in the signal path here, so resistors are about the only thing to change.

13th May 2012, 11:47 AM	#560
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7	I've listened to KOA Carbon Films and Dale CMF55, and prefer the Dales. The Carbon Films were too smooth for me. There is very little in the signal path here, so resistors are about the only thing to change. __________________ Salas Boards 2013 #2 CLICK HERE \| F6 Covertible PCB GB Boards Available \|DCB1 boards and KITS available PM\|SemiSouth R125, R100, R100A Available CLICK HERE \|F5TC Boards Sign UP CLICK HERE

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6th May 2012, 08:46 PM	#551
atupi diyAudio Member Join Date: Oct 2010 Location: Bucharest	Salas thanks for your inspiration, i've found the problem and like always was an human error in the pcb design. Now my buffer sings very very nice and makes a nice team with the Simplistic Riaa

6th May 2012, 09:53 PM	#552
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Excellent. Enjoy.

13th May 2012, 10:55 AM	#553
atupi diyAudio Member Join Date: Oct 2010 Location: Bucharest	After building and testing the DCB1 with plain resistors i want to buy some better quality resistors (mainly for buffer part) and i ask you what to choose (preferably from Mouser ). What about CF1/4CT52R221G KOA Speer Carbon Film Resistors - Through Hole or these RN55C2200BRE6 Vishay/Dale Metal Film Resistors - Through Hole If you have some other sugestion i'm open to something else.

13th May 2012, 11:02 AM	#554
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	Snake oil territory - beware. The Vishay RN55 are pretty good.

13th May 2012, 11:05 AM	#555
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	metal film, 1%, 25 or 50ppm/C, all copper connections (non iron, Fe) are very good. 0.1% and 15ppm are not worth paying the extra for unless the circuit specifically requires those.

13th May 2012, 11:38 AM	#557
atupi diyAudio Member Join Date: Oct 2010 Location: Bucharest	Forgot to ask you if worth to buy some BL grade transistors if i have matched GR transistors with Idss around 5.5

13th May 2012, 11:40 AM	#558
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	I used these eBay - The UK's Online Marketplace Whether you will notice any difference is up to you.

13th May 2012, 11:46 AM	#559
dimkasta Dimitris diyAudio Member Join Date: May 2010 Location: Athens	Guys I am waiting for some mesmerize boards I got from the diyaudio store and I am currently planning on the rest of the parts. What I was wondering is if there is a way to get two outputs from the board, so that I can drive 4 monoblock amps (dual - dual mono setup driving woofers and mid-twitters separately) Thanks a lot Dimitri